netdev - Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory low

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Date:   Wed, 17 May 2017 09:44:20 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Bjørn Mork <bjorn@...k.no>,
        Jim Baxter <jim_baxter@...tor.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory
 low

Am Dienstag, den 16.05.2017, 20:24 +0200 schrieb Bjørn Mork:
> 
> I must say that I don't like the additional complexity added here.  If
> there are memory issues and you can reduce the buffer size to
> USB_CDC_NCM_NTB_MIN_OUT_SIZE, then why don't you just set a lower tx_max
> buffer size in the first place?
> 
>   echo 2048 > /sys/class/net/wwan0/cdc_ncm/tx_max
> 

Hi,

that would hurt performance across the board though.
Can we trigger memory compactation earlier?

	Regards
		Oliver